package com.client;

import com.client.handler.UserClientHandler;
import com.lagou.RpcDecoder;
import com.lagou.RpcEncoder;
import com.lagou.pojo.RpcRequest;
import com.lagou.serializer.JSONSerializer;
import io.netty.bootstrap.Bootstrap;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.ChannelPipeline;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.string.StringDecoder;
import io.netty.handler.codec.string.StringEncoder;

import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.UUID;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

/**
 * @author 陶肖寅
 * @version V1.0
 * @Package com.lagou.client
 * @email fromlx@126.com
 * @date 2020-03-23 22:14
 * @Copyright © 2020-2021 城云科技(中国)有限公司
 */
public class RpcConsumer {
    //创建线程池对象
    private static ExecutorService executor = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());

    private static UserClientHandler userClientHandler;

    //1.创建一个代理对象 providerName：UserService#sayHello are you ok?
    public Object createProxy(final Class<?> serviceClass) {
        //借助JDK动态代理生成代理对象
        return Proxy.newProxyInstance(Thread.currentThread().getContextClassLoader(), new Class<?>[]{serviceClass}, new InvocationHandler() {
            public Object invoke(Object proxy, Method method, Object[] args) throws Throwable {
                //（1）调用初始化netty客户端的方法

                if(userClientHandler == null){
                initClient();
                }
                RpcRequest rpcRequest = getRpcRequest(serviceClass,method,args);
                userClientHandler.setPara(rpcRequest);
                // 去服务端请求数据
                return executor.submit(userClientHandler).get();
            }
        });


    }


    //2.初始化netty客户端
    public static void initClient() throws InterruptedException {
        userClientHandler = new UserClientHandler();

        EventLoopGroup group = new NioEventLoopGroup();

        Bootstrap bootstrap = new Bootstrap();
        bootstrap.group(group)
                .channel(NioSocketChannel.class)
                .option(ChannelOption.TCP_NODELAY, true)
                .handler(new ChannelInitializer<SocketChannel>() {
                    protected void initChannel(SocketChannel ch) throws Exception {
                        ChannelPipeline pipeline = ch.pipeline();
//                        pipeline.addLast(new StringEncoder());
                        pipeline.addLast(new RpcEncoder(RpcRequest.class, new JSONSerializer()));
                        pipeline.addLast(new RpcDecoder(RpcRequest.class,new JSONSerializer()));
//                        pipeline.addLast(new StringDecoder());
                        pipeline.addLast(userClientHandler);
                    }
                });

        bootstrap.connect("127.0.0.1", 8990).sync();

    }

    // 设置参数
    public static RpcRequest getRpcRequest(Class<?> serviceClass,Method method, Object[] args) {
        RpcRequest rpcRequest = new RpcRequest();
        rpcRequest.setClassName(serviceClass.getName());
        rpcRequest.setMethodName(method.getName());
        rpcRequest.setRequestId(UUID.randomUUID().toString());
        rpcRequest.setParameterTypes(method.getParameterTypes());
        rpcRequest.setParameters(args);
        return rpcRequest;
    }
}
